Add `drop_on_abort` option to VRL processing

[cometkim]

Is your feature request related to a problem? Please describe.

As reported on the Discord https://discord.com/channels/908281611840282624/915644818988863558/1335798024382971924

Quickwit always record a warn log on explicitly aborted transform with abort expression. But users may want to drop it.

Describe the solution you'd like

Originally there is drop_on_abort (default: true) option in Vector configuration.

https://vector.dev/highlights/2021-04-21-vrl-abort/

I'd like to suggest adding the same to Quickwit.

Describe alternatives you've considered

User could set RUST_LOG to such as quickwit_indexing::actors::vrl_processing=error to avoid the warning.

But it's far from ideal solution because it'll not inform user what is real problems or intentionally aborted ones.

[fulmicoton-dd]

thank you for the clear report.